Sodium Hydroxide → 6-Bromo-2-naphthalenecarboxylic acid

HRID 324224Notes

Reaction equation

Cl[O-:2].[Na+].[OH-].[Na+].[C:6]([C:9]1[CH:18]=[CH:17][C:16]2[C:11](=[CH:12][CH:13]=[C:14]([Br:19])[CH:15]=2)[CH:10]=1)(=[O:8])C>O.O1CCOCC1>[Br:19][C:14]1[CH:15]=[C:16]2[C:11](=[CH:12][CH:13]=1)[CH:10]=[C:9]([C:6]([OH:8])=[O:2])[CH:18]=[CH:17]2

Participants

Conditions

Temperature: 70 °C

Procedure

To a solution of sodium hypochlorite (62 ml, 5.25% in water (w/w), 3.6 g, 48.18 mmol) and sodium hydroxide (6.4 g, 160.6 mmol) in 50 ml of water was added a solution of 2-acetyl-6-bromonaphthalene (Compound L) 4 g, (16.06 mmol) in 50 ml of 1,4-dioxane. The yellow solution was heated to 70° C. in an oil bath for 2 hours, cooled to ambient temperature, and extracted with ethyl ether (2×50 ml). The aqueous layers were diluted with NaHSO3 solution (until KI indicator solution remained colorless) and then acidified (pH<2) with IN sulfuric acid to give a white precipitate. The mixture was extracted with ethyl ether, and the combined organic phase washed with saturated aqueous NaCl, dried (MgSO4) and concentrated to give 3.54 g (88%) of the title compound as a solid. 1H NMR (DMSO-d6): δ 8.63 (1H, br s), 8.32 (1H, d, J=2.0 Hz), 8.10 (1H, d, J=8.8 Hz), 8.00-8.05 (2H, m), 7.74 (1H, dd, J=2.0, 8.8 Hz).

Workup

temperaturecooled to ambient temperature
extractionextracted with ethyl ether (2×50 ml)
additionThe aqueous layers were diluted with NaHSO3 solution (until KI indicator solution remained colorless)
customto give a white precipitate
extractionThe mixture was extracted with ethyl ether
washthe combined organic phase washed with saturated aqueous NaCl
dry with materialdried (MgSO4)
concentrationconcentrated

Sources & evidence

ORD record: ord-18160d63c7644c30960cf794ce2973d5
Source dataset: uspto-grants-2001_04
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06218128B1

Reaction notes

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